Added

• Chrome-like CSS provenance in the Elements sidebar. Styles now shows matching author rules with cascade status, !important, active at-rule context, adopted and open shadow-root stylesheets, plus nearest-ancestor-first Inherited from … sections. Overridden and non-inherited declarations are crossed out, uncertain container/scope/layer declarations are identified, and the selected snapshot refreshes as the page changes. Cross-origin and browser user-agent rule bodies remain unavailable through page CSSOM, but their resolved values are still represented in Computed.

Fixed

• Readable error instead of a raw WebKit TypeError when tab access is missing. On Orion, chrome.tabs.query is relayed through window.webkit.messageHandlers and throws undefined is not an object (evaluating 'window.webkit.messageHandlers.tabs.postMessage') when that bridge lacks a tabs handler — and the popup showed that text verbatim. Tab queries now go through a resilient callback-form wrapper (lib/tabs.ts, same pattern as storage), the popup explains the failure in plain words, and the background's abandoned-session sweep skips — rather than falsely tombstoning every live session — when the tabs API is unavailable. Also hardened the launch path against an empty tab list, which previously crashed with the same style of unreadable TypeError.

• Diagnostics no longer log the inspected site's unhandled rejections. On Orion's WebKit runtime, page-world promise rejections reach the injected inspector's rejection listener, so site API failures (e.g. payload objects like {"status":0,...}) were recorded as extension errors and could crowd real ones out of the 100-entry ring buffer. Inspector-source rejections are now attributed via the reason's Error stack and only logged when they point into the extension's own code.

Added

• Diagnostics log, viewable from the popup. Uncaught extension errors from the background worker, the popup, and the injected inspector are recorded in a local ring buffer (last 100 entries, chrome.storage.local, never transmitted anywhere), with copy and clear buttons in a new popup section — a readable crash trail on devices with no console, like Orion on iPad.
• Session tombstones. Inspector sessions that end without a clean close (browser exit, page crash, or an OS memory kill) are detected at the next service-worker start and logged to the diagnostics log with their origin.
• Standalone SVG document support. The inspector now launches on SVG files opened directly in a tab (previously it failed with "injected but did not start"). On non-HTML documents the UI mounts inside a viewport-aligned <foreignObject> overlay and renders in its own iframe, sidestepping WebKit's foreignObject repaint bugs (observed on Orion for iPad).
• SVG elements are first-class in the Elements panel: selectable from the tree and the picker, with attribute editing, inline-style editing, matched rules, and forced states working on them like on HTML elements.
• Disabled tabs for unavailable panels. Panels that cannot work on the current page render as greyed-out tabs with a "Not available on this page" tooltip instead of opening empty: Cookies on non-http(s) pages, Storage where the document blocks storage access.
• Copy element from the tree. Hovering the selected row in the Elements panel reveals a copy button (styled like the Styles pane's row actions) that copies the element's complete outerHTML to the clipboard, with the inspector's own nodes stripped and a checkmark confirmation.
• Report an issue and Docs links in the popup. Two labeled icon links on the Diagnostics row open the GitHub new-issue page and the documentation site in a new tab — rendered as real anchors so they open reliably from the popup on every browser.

Initial public release, live on the Chrome Web Store.

Added

• In-page inspector window: movable, resizable from any edge or corner, dockable to the bottom, left, or right with a draggable split, launched from the toolbar popup with activeTab (no standing permission to read every site). Single instance per page, survives reloads until closed, and remembers the last panel per site.

• Elements panel: live DOM tree with hover highlighting, element picker, in-place DOM editing (attributes, tag text), DevTools-style Styles pane with matched rules, CSS authoring and validation, forced element states (:hover, :focus, ...) with per-state authored CSS, Computed pane with box-model diagram, DOM search, and breadcrumbs.

• Console panel: page log capture (log, info, warn, error, debug) over an unguessable per-launch channel, capture from document_start on granted origins, expression evaluation in the page context, type-colored values, file:line source links, filtering, and iOS Smart Punctuation straightening for iPad keyboards.

• Sources panel: collapsible file tree of the document, stylesheets, and scripts with syntax highlighting; external files fetched on demand; source links from the Styles pane jump straight to the owning file.

• Network panel: live fetch/XHR capture with headers, bodies, status, and timing; webRequest-backed headers for documents, styles, images, and fonts; Performance-timeline backfill; DevTools-style type filters.

• Cookies panel: full cookie table with in-place editing (including HttpOnly and Secure), add, delete, and clear, scoped per site or, behind an explicit opt-in, all sites.

• Storage panel: localStorage and sessionStorage viewing and editing.

• Theming: branded and Chrome-native looks, light and dark, following the OS or an explicit choice from the popup.

• Reduced-API browser support (Orion on iOS/iPadOS): page-bridge fallbacks for evaluation and capture, graceful degradation when extension APIs or the background are unavailable, and an error boundary so a single missing API cannot take the whole window down.